Improvement in locks



J. W. PAOKLER.

Look.

No;'206,712. Patented Aug. 6.1878;

UNITED STATES PATENT OFFICE.

JAMES \V, FAOKLER, OF LUMPKIN, GEORGIA.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 206,712, dated August6, 1878; application filed July 12, 1878.

To all whom it may concern:

Be it known that I, JAMES W. FAOKLER, of Lumpkin, Stewart county,Georgia, have invented Improvements in Locks, of which the following isa specification:

My invention is a lock constructed as fully described hereinafter, toreduce the cost of manufacture in comparison with locks of the samequality, to prevent the evil effects resulting in ordinary locks fromthe loss and breaking of keys, and to render as far as possible the lockburglar-proof.

In the drawing which forms part of this specification, Figure 1 is aside view of my improved lock, the cap being removed; Fig. 2, the same,the parts in a different position; and Fig. 3, a transverse section.

A is the case of the lock, of any suitable form, dimensions, andconstruction. I is an ordinary latch, pivoted at w, and G is a slidingbolt provided with notches and with a retainingspring, l), as usual. Aspindle, a, provided with a knob at the outside of the case, carries acam, E, by which the latch may be lifted from the outside, and the casehas a key-hole, y, through which a key may be inserted to throw forwardthe bolt. To a spindle, 0, extending only to the inner face of the lock,where it is provided with a knob, f, is secured a cam, F, the upper arm,1', of which bears on a pivoted lever, G, and thus lifts the latch,while the lower arm, 1', is reduced in thickness to play betweenshoulders c c at the inner side of the bolt 0, which is cut away to formthese shoulders, as shown in Fig. 2. To the latch 13 is secured one endof a plate, a, which extends downward, so as to cover and obstruct thekey-hole when the latch is down, forming a shield, which aids inpreventing access to the lock.

The shoulders c c are relatively so arranged that when the bolt isretracted the cam F can have sufiicient play to permit the latch B to beraised and depressed by turning the knob on the inside of the door,while a more extended movement in the direction of the arrow will bringthe arm z" against the shoulder 0, so as to throw forward the bolt andlock the door. A continued movement of the cam in the same directionwill carry the end a past the shoulder 20 to the position shown in Fig.2, so that the cam acts as a lock to hold the bolt in place, thuspreventing it from being forced back either by a key or any other tool,rendering access to the room from the outside impossible so long as thelock or door is not broken.

It will be noted, however, that the key may be used to lock the doorfrom the outside, while a spring, 8, between the cam and the case exertssuflicient friction to prevent the cam from accidentally taking theposition shown in Fig. 2.

A most important result of this construc tion is, that no key isrequired to open the lock from the inside, thus preventing any one frombeing locked in a room from loss or breakage of the key, or want ofknowledge as to its manipulation, for it will be apparent that the meregrasping and turning of the knob will instantly retract the bolt andlift the latch.

I claim 1. The combination, in a lock, of a latch, a cam operated fromthe inside and arranged to lift the latch, and a sliding bolt havingshoulders c 0, arranged to permit the play of the cam in lifting thelatch, but to aiford a bearing against the bolt when the cam is turnedto a greater extent, substantially as specified.

2. The combination of the latch, bolt, cam F, and shoulders c 10,arranged as described, so that the bolt is locked by the cam when in aforward position, as specified.

3. The combination of the latch, bolt, cam F, and plate a with the caseand its key-hole 3 as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES W. FAOKLER.

Witnesses: CHARLES E. Fosrna, COURTNEY A. COOPER.

